使用post-inst指令的apt-get和.desktop文件的奇怪行为

我们在本地Apt仓库（reprepro）中有一些手工构build的（带有fpm和jenkins）.deb文件。 这些.debs文件包含一个.desktop文件，该文件将被xdg-desktop在post-inst脚本中拾取。

如果我们手工安装deb文件，在一个新的系统上，一切都很好。

如果我们使用apt-get install安装新版本，我们会得到这个错误

xdg-desktop-menu: file '/usr/local/share/applications/customthingy.desktop' does not exist 

如果我用apt-get install -d customthingy下载deb文件，然后运行

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 dpkg -i /var/cache/apt/archives/customthingy_2-r3_all.deb 

我得到了和以前一样的xdg-desktop错误。 这样就排除了apt的问题。

如果我列出下载的deb的内容，

 tom.oconnor@charcoal-black:~$ dpkg --contents /var/cache/apt/archives/customthingy_2-r3_all.deb |grep ".desktop" -rw-r--r-- root/root 201 2011-07-28 20:02 ./usr/local/share/applications/customthingy.desktop 

你可以看到文件存在。

但是，如果我们在重新安装前清除，

 tom.oconnor@charcoal-black:~$ sudo apt-get purge customthingy Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be REMOVED customthingy* 0 upgraded, 0 newly installed, 1 to remove and 84 not upgraded. After this operation, 0B of additional disk space will be used. Do you want to continue [Y/n]? y (Reading database ... 219342 files and directories currently installed.) Removing customthingy ... Purging configuration files for customthingy ... 

接着

 tom.oconnor@charcoal-black:~$ sudo apt-get install customthingy Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed customthingy 0 upgraded, 1 newly installed, 0 to remove and 84 not upgraded. Need to get 0B/4,030B of archives. After this operation, 0B of additional disk space will be used. Selecting previously deselected package customthingy. (Reading database ... 219319 files and directories currently installed.) Unpacking customthingy (from .../customthingy_2-r3_all.deb) ... Setting up customthingy (2-r3) ... 

编辑：Postinst脚本的内容

 #!/bin/sh # Add an entry to the system menu XDG_DESKTOP_MENU="`which xdg-desktop-menu 2> /dev/null`" if [ ! -x "$XDG_DESKTOP_MENU" ]; then echo "WARNING: Could not find xdg-desktop-menu" >&2 else "$XDG_DESKTOP_MENU" install --mode system /usr/local/share/applications/customthingy.desktop "$XDG_DESKTOP_MENU" forceupdate --mode system fi 

没有错误。 所以..问题是这些：

1. 这是预期的行为，还是apt / dpkg中的错误？
2. 我们有一个与customthingy.deb格式不正确的包，防止未来的重新安装运行？
3. 是否安全地假设安装后会一直发生在安装完成后，我们可以安全地假设在这个时间点之前所有的文件都已经被提取出来了？
4. 我们做的事情是不是很奇怪？

 "$XDG_DESKTOP_MENU" uninstall --mode system /usr/local/share/applications/customthingy.desktop 

 action="$1" if [ "$2" = "in-favour" ]; then # Treat conflict remove as an upgrade. action="upgrade" fi # Don't clean-up just for an upgrade.` if [ "$action" = "upgrade" ] ; then exit 0 fi